Bitcoin ( ₿ ) is a cryptocurrency single administrator that can be sent from user to user on the peer- to- peer bitcoin network without the need for intermediaries. The mathematical field of cryptography is the basis for Bitcoin' s security.

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A black market, underground economy, or shadow economy is a clandestine market or series of transactions that has some aspect of illegality or is characterized by some form of noncompliant behavior with an institutional set of rules. If the rule defines the set of goods and services whose production and distribution is prohibited by law, non- compliance with the rule constitutes a black pengetahuan saya, tidak pernah ada standar yang menyebutkan angka2 besaran untuk parameter lumpur.